Sphaerotilus natans (previously known as Cladothrix dichotoma), one of two free-living bacteria which form branching arrays; in this case the branches are ‘false’ - filaments adhere to each other in a way which looks as it there is a branching colony. Colourless. May be found in flocs, and encountered in sewage treatment systems. These images were taken of protozoa among marginal debris in the slow moving freshwater stream at Audley in New South Wales Australia by Feng Wie-Song and D. J. Patterson. Image copyright: Wie-Song Feng and D. J. Patterson, image used under license to MBL (micro*scope).
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